Two-Cheese Squash Casserole

INGREDIENTS

4 lb

yellow squash, sliced

4 tbsp

butter or margarine, divided

large sweet onion, finely chopped

garlic cloves, minced

2 1/2 cups

soft breadcrumbs, divided

1 1/4 cups

shredded Parmesan cheese, divided

1 cup

shredded Cheddar cheese

1/2 cup

chopped fresh chives

1/2 cup

minced fresh parsley

1 8 ounce container

sour cream

1 tsp

salt

1 tsp

freshly ground pepper

large eggs, lightly beaten

1/4 tsp

garlic salt